Pinout: B1
Games: Choplifter, My hero, Pitfall, Regulus, Wonderboy.



PCB Pinout          Parts Side/Solder Side
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Ground                  |  1  |  A  | Ground
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Ground                  |  2  |  B  | Ground
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+5 Volts                |  3  |  C  | +5 Volts
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+5 Volts                |  4  |  D  | +5 Volts
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Coin Meter 1            |  5  |  E  | Coin Meter 2
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+12 Volts               |  6  |  F  | +12 Volts
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                        |  7  |  H  |  
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1P Button B             |  8  |  J  | 2P Button B
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1P Button A             |  9  |  K  | 1P Button A
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                        |  10 |  L  |  
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1P Down                 |  11 |  M  | 2P Down
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1P Up                   |  12 |  N  | 2P Up
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1P Right                |  13 |  P  | 2P Right
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1P Left                 |  14 |  R  | 2P Left
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Coin 1                  |  15 |  S  | 1P Start
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Coin 2                  |  16 |  T  | 2P Start
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Test                    |  17 |  U  |
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Service                 |  18 |  V  | 
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Speaker +               |  19 |  W  | Speaker _
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TV Red                  |  20 |  X  | TV Green
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TV Blue                 |  21 |  Y  | TV Sync
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TV Ground               |  22 |  Z  | Ground
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